Pump jack



Feb. 7, 1928.

. 1,658,306 0. M. SHOLBERG PUMP JACK Filed Dec. 2. 1926 2 Sheets-Sheet 1 r d n m a P w Q I Q ODD L J1 Q x w v N} 1 N II]. anmwlio'c p a 722. 572022 7 Witness .jqw I I a, ifi m Manama Feb. 7, 1928. 1,658,306

0. M. SHOLBERG PUMP JACK Filed Dec. 2. 1926 2 Sheets-Sheet 2 Fla-.11..

' 2% 0 wane/aces 2. 5 k/ elf tonnage while the latter is being operated, and this.

Patented Feb. 7,1928.

UNITED STATES PATENT 'o oLE M. SI-IOLBERG, or FERGUS FALLS, MINNESOTA.

FFI

PUMP Jack.

Application filed December 2, 1926. Serial No.:152,222.

The invention relates primarily 'to' jacks for use in connection .with vertically disposed water pumps ofthe type. whose pump rod projects vertically above the pump body.

Most jacks heretofore devised, exert quite a serious lateral strain upon the pump rod strain Causes excessive wearing otthe rod as well as its guldes, and interferes lllitlellilh ly with smooth and easy operation of the. pump. It is one object of the; present in-.

vention to provide'a pump aclr in which this difficulty does'not exist. 1

and improved construction which may be quickly. and easily applied to an ordinary pump. I i

' lVith the foregoing in view, theinvention resides in the novel subject matter hereinafter described and claimed, the description being supplemented by the accompanying drawings.

Fig. 1 and Fig.2 are side elevations looking in different directions, showing the 1111- proved jack and counterbalancing means upon a pump. I

Fig. 3 is a disassembledperspective view, parts being omitted. V

Fig. 4 is a horizontal section on line 4cl of Fig. 2.

The details of construction herein disclosed, represent the preferred form of the invention and while they will be specifically described, it is to be understood atthe outset, that within the scope of the invention as claimed, variations may be made.

P denotes a well platform from which a pump P rises rigidly, said pump having the usual upstanding pump rod R.

Disposed at opposite sides of the pump body and the pump rod, are two vertical bars 5 having their upper ends directed toward each other and'connccted with the upper end of said rod by a bolt or the like 6. Guides are provided "for the lower ends ot-these bars, positioned at opposite sides of the pump body, and a pair of additional bars 7 have their lower ends pivoted at 8 to the lower ends of said bars 5, the upper ends of said bars 7 being connected with means for reciprocating them. As" this reciprocation takes place, the bars 5 must necessarily move only reetilinearly and hence can exert no lateral stress upon the pump rod R. In the construction herein Cl1SCl0S8Cl,'l'l1G upper ends 0t the bars 7 aresecured to a bearing Q,.Wl1l0l1 bearing engages a crank 10 on a shaft '11. Thlsshaft may be mounted in any desired manner and if apump house is provided for the pump, said shaft may be disposed in the upper portion thereof., When the pump is used in the open however, the shaft 11 may well be'supported by-an appropriate frame structure 12 secured to and-rising from the platform P. A gas engine, electric motor or the like maybe employed to drivethe shaft 11,and I have shown it provided with a belt wheel 13 for engagement with a belt driven by the prime mover.

In providing the guides for the bars 5, I

preferto make use of two blocks 14 disposed at opposite sides of the pump body and having seats 15 in their inner sides, to jointly receive said body. The outer sides of these blocks are formed with vertical grooves or notches 16 which slidably receive'the bars 5, i

and these notches or grooves are spanned by plates 17, so that the latter co-operate with said notches or grooves in forming effective guides for thebars. The blocks 14 and plates17 are formed with alined bolt holes 18, and bolts 19 are passed through these holes, so as to hold said plates and blocks in assembled-relation, as well asrigidly clamping the blocks against the pump body. These details of. construction are not only simple and inexpensive, but adapt the device for quick and easy attachment and moreover are very desirable and efficient when installed.

-In the present showing, a- U-shaped member 20 is secured to the lower ends of the bars 5, and one end of a cable 21 is secured tothis member, the other end of the cable being provided with a counterbalancing weight 22. This cable passes over a sheave 23 and its weight is sufliciently heavy to substantially counterbalance the weight or the rod R, the pump jack parts which move vertically withthe rod, and the well-contained portions ofthe pump connected with this rod. By the use of the counterbalancing weight and cable, only about half as The sheave 23 is rotatably supported ha Q1 J r 1,658,306

tween a pair of inverted Leshaped bars 24c having feet 25 at their lower ends to be secured by lag screws or the like 26 to the pump P. The lateral ends 01" these bars are preferably bowed away from eacn other to some extent as shown in Figs. 3 and a and disposed at opposite sides oi the pump body, and by means of bolts 2?, said lateral ends may be tightly clamped to said body. lhus, the sheave 23 will be properly supported and it will be seen that the bars 24 may be quickly and easily attached to the pump and platform.

The entire assembly is exceptionally simple and inexpensive, yet will be eliicient, reliable and in every way desirable. On account of such existing advantages, the details disclosed are preferably "followed. However, within the scope of the invention as claimed, variations may be made.

I claim:-

1. A jack for a pump of a type having a fixed body a recti nearly movable pump rod projecting thercfroi'n; said jack comprising a pair of parallel bars disposed longitudinally of said body and rod and at opposite sides thereof, means onnecting; one end of said bars to said pump rod, guides rigidly mounted at opposite sides of said body and slidably engaging the other ends of said bars, and means connected with said bars for reciprocating the same, said guides and rod insuring that the bars shall move rectilinearly to exert no lateralst-ress on the rod.

2. A jack for apump of a type having a fixed body and arectilinearly movable pump rod projecting theretrom said jack comprising a pair of parallel bars disposed longitudinally of said body and rod and at opposite sides thereof, means for connetting one end 0;. said bars to said pump rod, guides rigidly secured to opposite sides of said body and slidably engaging the other ends of said'bars, and means connected with said bars for reciprocating the same, said guides and rod insuring that the bars shall. move rectilinearly to exert no lateral stress on the rod.

3. A jack for apump of a type having a vertical body and a vertically movable pump rod rising from said body; said jack comprising a pair of vertical bars disposed at opposite sides of the body and rod, means for connecting thevupper ends or" said bars to the rod. stationary guides for the lower portions of said bars, a pair of additional vertical bars at the outer sides oi the first named bars, said additional bars being pivotally connected with the lower ends of the first named bars, and means connected with the upper ends of said additional bars for reciprocating the latter.

i. In a pump jack. a pair of blocks for disposition at opposite sides of a pump body,

'said blocks having seats in their inner sides to engage said pump body and being provided with guides for pump actuating bars, and means for drawing said blocks into clamping relation with the pump body to fixedly secure them thereto. 1

5. In a pump jack, a pair of blocks for disposition at opposite sides of a pump body, said blocks having seats in their inner sides to engage said pump body and being formed in their outer sides with notches, plates spanning said notches andco-operating therewith in forming guides for pump actuating bars, said plates and blocks'having alined bolt holes, and bolts passing through said holes for holding the plates and blocks in assembled relation and for clamping said blocks to the pump body.

In testimony whereof I have hereunto aiiixed my signature.

OLE M. SHOLBERG. 

